Lantern



G. HAMM.

LANTERN.

(No Model.)

No. 591,647. Patented Oct. 12,1897.

UNITED STATES PATENT OFFICE.

CHARLES HAM, OF PITTSBURG, PENNSYLVANIA.

LANTERN.

SPECIFICATION formingpart of Letters Patent No, 591,647, dated October 12, 1897. Application filed April 5,1897. smart. 630,906. (No model.)

To alt whom, it may concern:

Be it known that 1, CHARLES HAMM, a citizen of the United States, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented or discovered a new and useful Improvement in Lanterns, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 is a front elevation of a lanternglobe made in accordance with rnyinvention and provided with my deflecting-lens. Fig. 2 is a central vertical section taken on the line II II of Fig. 1. Fig. 3 is a cross-section taken on the line III III of Fig. 2. Fig. 4 is a partial sectional view similar to Fig. 2, showing the lens in a different position. Fig; 5 is a detail view illustrating a modified construction of lens.

My invention relates to an improvement in lantern-globes and detachable adjustable deflecting-lenses therefor, and has especial reference to the manner of constructing the lantern-globe and the lens employed.

Referring to the drawings, 2 is the body of a lantern-globe provided at one side with a circular opening and a surrounding outwardly-projecting flange 3, having an external screw-thread 4, the edges of the flange 3 being ground flat, so as to conform to a plane surface.

My improved lens or bulls-eye 5 is provided at its back with a corresponding plane light-receiving surface 6, while the plane of the front or light-emitting surface is made at an angle to the back surface, so that the rays of light due to. the law of refraction will be deflected, as in a prism and as indicated by the arrows at b.

The lens is secured upon the flange 3 by a screw-threaded collar 7, provided with an inwardly-turned flange 8, engaging a peripheral flange 9 around the edge of the lens. By this means I am enabled to change the lens, so as to throw the rays of light at different angles, by loosening the collar '7 and turning the lens.

In lanterns provided with an undeflecting lens, as shown in patent to Ewing and Bill, No. 275,474, with which I am familiar, it is necessary to tip the lantern in order to throw the light up or down, whereas with my improved construction the lantern may be held to any position, or the lenses may be made of any desired color, and the operation of changing either the position of the lens or the lens itself for another may be accomplished in a very short time and with great ease.

Changes and modifications will suggest themselves to the skilled mechanic, and the proportions, shape, and size of the globe and lens may be altered to suit varying conditions of use, and I desire to include all such variations as within the scope of my invention.

What I claim, and desire to secure by Letters Patent, is

1. The combination of a lantern-globe having a circular opening in its side, a lens having an inner annular face conforming to the plane of the opening, an outer light-emitting face conforming to a nonparallel plane, and means for securing the lens upon the face of the opening and permitting of its rotation thereon; substantially as set forth.

2. In combination with a lantern globe provided with a circular opening in its side, outwardly-extending screw-threaded flanges and a threaded collar thereon provided with an inwardly-extending annular flange; a lens provided with an annular flange secured upon the face of the opening by the flanged collar, having an inner annular face conforming to the plane of the opening, and an outer, light-emitting face, the axial center of which is at an acute angle to such inner face and to the face of the opening, whereby the lens may be rotatably adjusted upon the face of the opening by loosening the collar, substantially as set forth.

In testimony whereof I have hereunto set my hand this 18th day of February, 1897.

CHARLES HAMM.

Witnesses:

PETER J. EDWARDS, 0. M. CLARKE. 

